Door-bell and burglar-alarm.



M. R. 'SGHAFFER.

DOOR BELL AND BURGLAR ALARM.

APIPLIOATION FILED MARJS, 1914.

1,130,436. r n ed Manz, 1915.

TH-E NORRIS PETERS 60., PHom-LlTl-ta. WASHING I'ON, D. C.

trivia ST 1 RATE Jrc.

MARTIN R. SCHAIEFER, OF READING, PFNNSYLVANIA.

DOOR-BELL AND BURGLABFALARM.

To all whom it may concern Be it known that I, MARTIN R. SoHAFrER, a citizen of the United States, residing at Reading, in the county of Berks and State of Pennsylvania, have invented certain new and useful Improvements in Door-Bells and Burglar-Alarms, of which the following is a s ecification.

My invention relates to improvements in combined door bell and burglar alarm, and the main object of my invention is the provision of means which will serve the twofold purpose of a door bell or burglar alarm, and which will be of such simple and inexpensive construction as to make its use highly desirable.

Another object of my invention is the provision of means which can be operated from the door knob or by means of a push-button to serve the purpose of a door bell or burglar alarm, which will be absolutely positive and reliable in operation, which will be of compact and small size, which will be of ornamental and attractive appearance, and from every point of view will be thoroughly efficient and practical.

\Vith these objects in view, my invention consists of a combined door-bell and burglar alarm embodying novel features of construction and combination of parts, substantially as disclosed herein.

In order that the construction in detail and the operation of my invention may be fully understood and its many advantages be appreciated, I have illustrated in the accompanying drawing a mechanism embodying my invention.

Figure 1 represents a front elevation or face View of my invention, partly broken away to illustrate the construction of certain parts of the mechanism. Fig. 2 represents a vertical central sectional view, partly in elevation, of my improvement applied to a door, and Fig. 3 represents a view, partly in section and partly in elevation, of a push button mechanism for use in connection with my improvement. v

In the drawings: The letter A designates a portion of the door to which is attached by means of screws or like fastenings B, the base or supporting plate C, which is spaced or raised away from the door and has fulcrumed thereon at D, the lever E, whose upper end is formed with the open head or yoke F, having its upper wall formed with teeth to provide a rack G, and its lower end Specification of Letters Patent.

provided with a vertical slot H, adapted to receive the stem J, on the head J, fitted in said opening ;or slot'I-I, andwith said pin and lever is connected the strapK, having near its lower end an angular opening K, to fit upon the spindle L, of the door knob L. From this construction it will be observed that to the door is connected the base or supporting plate and pivoted thereon is the lever E, and that the turning of the door knob L, rocks the strap K, which rocking is transmitted to the lower slotted end of the lever E, moving said lever upon the supporting plate and in consequence reciprocating the yoke F, with its rack G, which rack meshes with the pinion M, mounted on the pin or stud N, which supports and secures the bell 0, turns the wheel P, formed with the series of teeth Q, and that the rotation of said toothed wheel brings its teeth into contact with the arm R. carrying the hammer R, and formed with an attaching portion R and a pair of spring loops or bends R the engagement of the teeth with said spring arm causing the hammer to strike the hell with a quick movement sounding the alarm or ringing the bell as a door bell.

The construction described is operated by means of the door knob. and if desired, the push button shown in Fig. 3 may be employed, which consists of the hollow guide casing S, secured in the door, the push button S, formed with the stem 3*, having the inclined lug S adapted to enter the key slot C of the supporting plate and engage the lower portion of the lever at one side, which action moves the lever in the same manner as the turning of the door knob, and in a like way rings the bell, and to restore the push-button to normal position, I place around its stem S the coiled spring S, which returns the push button to normal or initial position. Also for the purposeof returning the lever to normal position or to assist in this function, I employ the coiled spring T, whose ends T are connected to the supporting plate and the lever, as shown in Fig. 1, said spring assisting in restoring the lever to normal position.

From the foregoing description, taken in Patented Mar. 2, 1915.

AppIication filed March 13, 1914. Serial No. 824,423. I

connection with the drawing, the operation of my improvement will be readily understood, and it will be apparent that the reciprocation of the lever, either by the turning of the knob or the pushing inward of the push-button, causes the rack on said lever to rotate the meshing pinion, which revolves the toothed Wheel, causing its teeth to quickly engage thespring hammer arm, bringing its hammer rapidly against. the bell, producing a loud vibrating alarm, which Will prove ei'iicient either for service as a door-b'ell or burglar-alarm.

I claim:

A supporting base, a lever mountedthereon and having atone end a yokewith teeth and atvthe other end an elongated slot, a strap having one end provided with an angular opening to fit upon the spindle of a doorknob, a stem carried by the other end of said strap and engageable in the slot of ones the lever, a stud carried by the base, a pinion loosely mounted on said stud and engaging the teeth of said yoke, a toothed Wheel loosely mounted on said stud and connected to said pinion, a bell and a hammer mounted on said stud, said hammer having spring bends and a portion in the path of said toothed Wheel, said strap adapted to be rocked by turning of the door knob.

In testimony whereof I afiix my signature in presence of two Witnesses.

MARTIN R. SCHAFFER. Vtitnesses JOHN L, TREXLER, M. A. SoI-IAFFER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Eetents Washington, D. C. 

